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arxiv: 2606.02460 · v1 · pith:MKB5MSEDnew · submitted 2026-06-01 · ❄️ cond-mat.mes-hall

Nonequilibrium transport in epitaxial CsPbBr3 single crystals

Seryio Saris , Roberto Rosati , Vladimir Bruevich , Thomas J. Sheehan , Maksim Roman , Vitaly Podzorov , Ermin Malic , William A. Tisdale This is my paper

Pith reviewed 2026-06-28 13:05 UTC · model grok-4.3

classification ❄️ cond-mat.mes-hall
keywords CsPbBr3nonequilibrium transporthot excitonsperovskite single crystalstransient microscopyexcitonic effectscarrier diffusivity
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The pith

In CsPbBr3, equilibrium transport holds only above 60 K; below that, hot excitons and a quasi-localized state move while cooling together.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper establishes that the usual picture of a single thermalized carrier population with fixed transport coefficients describes CsPbBr3 near room temperature but fails when excitonic effects strengthen at low temperature. Transient microscopy reveals two coupled populations below about 60 K: a short-lived hot-exciton gas whose diffusivity reaches 25-30 cm²/s and a quasi-localized state that receives carriers as the hot gas cools. This inseparability of transport and thermalization means the timescale separation assumed in conventional semiconductor theory does not apply. If correct, the result supplies a direct experimental window onto the competing rates of exciton formation, interconversion, and cooling in these materials.

Core claim

Optically measured carrier mobilities in epitaxial CsPbBr3 single crystals match Hall-effect and field-effect transistor values across a wide temperature range, validating the equilibrium framework in the free-carrier regime. Below ~60 K, however, two coupled populations appear: a transient hot-exciton gas with diffusivity 25-30 cm²/s that greatly exceeds the value expected for thermalized excitons, and a quasi-localized state fed by the cooling of that gas. Transport and thermalization therefore occur together rather than as separable processes.

What carries the argument

Two coupled populations: a transient (<100 ps) hot-exciton gas and the quasi-localized state that is fed by its cooling.

If this is right

  • Equilibrium models cease to apply once excitonic effects dominate.
  • Carriers redistribute among internal degrees of freedom while they are still moving.
  • Competing kinetics of exciton formation, interconversion, and cooling become directly measurable.
  • Energy flow in perovskite photonic devices can be controlled by tuning these coupled populations.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same nonequilibrium regime may appear in other lead-halide perovskites once their exciton binding energies place the crossover near accessible temperatures.
  • Device designs that deliberately slow or accelerate exciton cooling could exploit the high-diffusivity window to improve charge extraction.
  • Extending the temperature range or adding controlled disorder might map how the two-population regime evolves into conventional behavior.

Load-bearing premise

The transient high-diffusivity population must be a hot-exciton gas whose cooling directly populates the localized state.

What would settle it

Transient microscopy data showing only a single population whose diffusivity matches thermalized excitons at all temperatures below 60 K, or showing no feeding relation between the fast and slow components, would falsify the central claim.

read the original abstract

Transport of optically excited carriers in semiconductors is typically described within a quasi-equilibrium picture, where energy is carried by a single thermalized quasiparticle population characterized by well-defined transport coefficients. Here, we demonstrate that in epitaxial CsPbBr3 perovskite single crystals, this picture holds near room temperature - but breaks down dramatically at low temperature. Using transient microscopy, we show that optically measured carrier mobilities match device-scale Hall-effect and field-effect transistor measurements across a broad temperature range, resolving reported discrepancies and validating the equilibrium framework in the free-carrier regime. Below ~60 K, however, when excitonic effects become significant, equilibrium models begin to fail. We observe two coupled populations: a transient (<100 ps) hot-exciton gas with a diffusivity ~25-30 cm<sup>2</sup>/s - greatly exceeding the diffusivity expected for thermalized excitons - and a quasi-localized state that is fed by the cooling of the hot-exciton gas. These results reveal that in CsPbBr3, transport and thermalization are not separable processes: carriers move while still redistributing among internal degrees of freedom, breaking the timescale separation that underpins equilibrium transport theory in conventional semiconductors. By resolving transport at the population level, we can directly access the competing kinetics of exciton formation, interconversion, and cooling, offering a new space for controlling energy flow in perovskite materials and their photonic applications.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 1 minor

Summary. The manuscript claims that in epitaxial CsPbBr3 single crystals, the quasi-equilibrium transport picture holds near room temperature, where optically measured carrier mobilities match Hall-effect and field-effect transistor data across a broad temperature range. Below ~60 K, when excitonic effects become significant, this picture breaks down: transient microscopy reveals two coupled populations consisting of a transient (<100 ps) hot-exciton gas with diffusivity ~25-30 cm²/s (greatly exceeding that expected for thermalized excitons) and a quasi-localized state fed by its cooling. This demonstrates that transport and thermalization are not separable processes, breaking the timescale separation of equilibrium theory and enabling population-level control of exciton kinetics.

Significance. If the central claims hold after addressing the points below, the work would be significant for perovskite optoelectronics and nonequilibrium carrier dynamics. It resolves reported discrepancies between optical and device-scale mobility measurements, validates the equilibrium framework in the free-carrier regime, and identifies a low-temperature regime where population-level transport reveals competing kinetics of exciton formation, interconversion, and cooling. This offers a new experimental handle on energy flow in materials where excitonic effects dominate, with potential implications for photonic applications.

major comments (2)
  1. [Abstract / low-T regime description] Abstract / low-T regime description: The assignment of the transient (<100 ps) high-diffusivity (~25-30 cm²/s) population specifically to a hot-exciton gas (as opposed to unthermalized free carriers, residual free-carrier diffusion, or a microscopy artifact such as local heating or probe nonlinearity) is load-bearing for the claim that equilibrium models fail and that transport and thermalization are inseparable. The manuscript does not present an explicit alternative-model rejection, spectral signatures, or exclusion criteria for this assignment in the abstract-level description.
  2. [Comparison with Hall/FET data] Comparison with Hall/FET data: The assertion that optical mobilities match Hall-effect and FET measurements across temperatures (validating the equilibrium framework) lacks details on raw data presentation, error analysis, temperature sampling, or data-point exclusion criteria. Without these, the support for the central nonequilibrium claim at low T cannot be fully verified from the presented evidence.
minor comments (1)
  1. [Abstract] The HTML superscript in the abstract (cm<sup>2</sup>/s) should be rendered consistently in the final manuscript.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful reading and constructive comments, which have helped us improve the clarity of our manuscript. We respond to each major comment below and indicate where revisions will be made.

read point-by-point responses

  1. Referee: [Abstract / low-T regime description] Abstract / low-T regime description: The assignment of the transient (<100 ps) high-diffusivity (~25-30 cm²/s) population specifically to a hot-exciton gas (as opposed to unthermalized free carriers, residual free-carrier diffusion, or a microscopy artifact such as local heating or probe nonlinearity) is load-bearing for the claim that equilibrium models fail and that transport and thermalization are inseparable. The manuscript does not present an explicit alternative-model rejection, spectral signatures, or exclusion criteria for this assignment in the abstract-level description.

    Authors: We agree that strengthening the abstract-level description of the hot-exciton assignment would improve accessibility. While the full manuscript (Sections 3.2–3.4 and 4.1) already includes spectral signatures (initial PL blue-shift and narrowing during the <100 ps window, absence of Drude response in TA, and excitation-density-independent diffusivity), control experiments excluding local heating and probe nonlinearity, and temperature-dependent comparison to expected thermalized exciton diffusivity, these are not summarized in the abstract. We will revise the abstract to explicitly reference the spectral and control evidence that rejects free-carrier or artifact interpretations, thereby making the assignment more transparent at the summary level. revision: yes

  2. Referee: [Comparison with Hall/FET data] Comparison with Hall/FET data: The assertion that optical mobilities match Hall-effect and FET measurements across temperatures (validating the equilibrium framework) lacks details on raw data presentation, error analysis, temperature sampling, or data-point exclusion criteria. Without these, the support for the central nonequilibrium claim at low T cannot be fully verified from the presented evidence.

    Authors: We acknowledge that additional methodological transparency on the mobility comparison would strengthen verifiability. Figure 2 and the associated text report the temperature-dependent optical mobilities overlaid with literature Hall and FET values, but we will expand the supplementary information to include: raw mobility data tables from individual devices and optical runs, standard-error analysis from replicate measurements (n=3–5 per temperature), the complete set of sampled temperatures (10–300 K), and explicit inclusion criteria (SNR threshold >10 and consistency across at least two crystals). These additions will allow direct verification of the agreement above ~60 K without changing any numerical results. revision: yes

Circularity Check

0 steps flagged

No circularity: claims rest on direct experimental comparison without self-referential reduction

full rationale

The paper presents observational results from transient microscopy on CsPbBr3 crystals, reporting measured diffusivities and population behaviors that are compared against independent device-scale Hall-effect and FET measurements. No equations, fitted parameters, or derivations are shown that define the reported hot-exciton diffusivity or the two-population assignment in terms of the same data by construction. The low-temperature breakdown of equilibrium models is asserted via experimental mismatch with expected thermalized-exciton values, not via any self-definitional loop, fitted-input prediction, or load-bearing self-citation chain. The derivation chain is therefore self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Abstract-only review; no free parameters, axioms, or invented entities are explicitly introduced or quantified in the text.

pith-pipeline@v0.9.1-grok · 5814 in / 1204 out tokens · 30197 ms · 2026-06-28T13:05:00.172801+00:00 · methodology

discussion (0)

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Works this paper leans on

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